Me and a friend of mine visited the island in june 2005. It was pretty hot but there are lots of places to get out of the sun. We brought a small kayak and snorkel gear in addition to all our other camping gear it was incredible. The snorkeling is the best I experienced in the keys and the fact that there is no technology on the island whatsoever is great. The history and the fort are interesting too, but I would say the solitude, and scenery are the selling points.